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These ornamental stones cleaved easily to form faceted gemstones, but this treatment was reserved for small samples and specimens of the most popular colors: pale blue, green, yellow, purple, pink, and red. A purple-and-white banded variety known as Blue John was mined in large blocks and was used for carving.[3][4][5] A typical stone had a base value of 10 gp, with the higher valued stones tended to be the red and pink varieties.[3][4]

All varieties of fluorspar gave off a faint green glow when invisible creatures or objects were within 20 ft (6.1 m). Fluorspar did not react to ethereal objects or creatures, nor to things or beings merely disguised.[5]